In this rapid TLC method of analysis for the urinary cannabinoid metabolite, 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH), hydrolyzed urine specimens are aspirated through a porous, alkyl-silica extraction layer located along the lower edge of a biphasic thin-layer chromatogram; THC-COOH is simultaneously extracted from the sample and concentrated on the TLC plate for subseq...

The process of transport clustering is a tool for the regional spatial development country, since it contributes to elimination infrastructural constraints, increasing availability and quality main infrastructure competitiveness territory. choice territory creation logistics cluster (hereinafter - TLC) an important stage in process, but there no methodology that assesses conditions region TLC. ...

OBJECTIVE To develop a TLC-densitometric method for the determination of barakol content in Senna siamea leaf and flower extracts, and to compare the barakol content in mature leaves, young leaves and young flowers of the plant which are consumed as a vegetable in curry. MATERIALS AND METHODS The extraction of pure barakol was performed by boiling the fresh young leaves of S. siamea with 0.5%...

The relation between pulmonary distensibility, lung volume, and elastic recoil pressure was examined in 45 patients (38 men) with cryptogenic fibrosing alveolitis (mean age 61 (SD 14) years). Exponential analysis of static pressure-volume data obtained during deflation of the lungs gave the exponent K, an index of the distensibility of the remaining inflatable lung tissue. Total lung capacity (...

The monohydroxy bile acid taurolithocholate (TLC) causes a rapid and transient increase in free cytosolic Ca2+ concentration ([Ca2+]i) in suspensions of rat hepatocytes similar to that elicited by the InsP3-dependent hormone vasopressin. The effect of the bile acid is due to a mobilization of Ca2+, independent of InsP3, from the endoplasmic reticulum (ER). Short-term preincubation of cells with...

MTT assays showed an intense antiproliferative activity (80%) of Aloe arborescens leaf skin extracts tested on murine myeloma cells. Bioassay-guided fractionation carried out by TLC allowed the identification of a spot showing antiproliferative activity; HPLC and NMR investigations showed that the TLC spot consisted of aloenin A and aloins A and B. The effects of the leaf extract and of the TLC...

Free porphyrins, especially copro-, uro-, and protoporphyrin, were successfully separated by talc thin-layer chromatography (TLC), and were determined from the relationship of the weight and the area of porphyrins in the spot on the thin-layer plate. The results obtained from both the solvent extraction and the simple, rapid TLC method reported in this paper showed good correlation for copropor...

The carotenoids of yellow, red and tangerine tomato fruits were separated and identified by thin-layer chromatography (TLC). β-carotene is extracted with a mixture content hexan and acetone. The various systems of adsorbents and solvents for TLC of carote and tomato carotenes were examined, and it was revealed that the most suitable TLC system for separation and identification was silica gel pl...

TLA is a specification language for concurrent and reactive systems that combines the temporal logic TLA with full first-order logic and ZF set theory. TLC is a new model checker for debugging a TLA specification by checking invariance properties of a finite-state model of the specification. It accepts a subclass of TLA specifications that should include most descriptions of real system designs...